Jacobsthal, Ernst

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Jacobsthal, Ernst Gender: M
Ernst Erich Jacobsthal
born on 16 October 1882 at 01:15 (= 01:15 AM )
Place Berlin, Germany, 52n29, 13e21
Timezone LMT m13e21 (is local mean time)
Data source
BC/BR in hand
Rodden Rating AA
Collector: Scholfield
Astrology data s_su.18.gif s_libcol.18.gif 22°33' s_mo.18.gif s_sagcol.18.gif 04°40 Asc.s_leocol.18.gif 27°32'


German mathematician whose PhD dissertation, Anwendung einer Formel aus der Theorie der quadratischen Reste (Application of a Formula from the Theory of Quadratic Remainders), provided a proof that prime numbers of the form 4n + 1 are the sum of two square numbers.

In 1906, he earned his PhD at the University of Berlin, where he was a student of Georg Frobenius, Hermann Schwarz and Issai Schur.

In 1934, he was fired from his professorship at the Technische Hochschule Berlin, because of his Jewish origins. In 1939 he fled to Norway and became after the war a professor at the technical university of Trondheim.

He was a brother to the archaeologist Paul Jacobsthal. He died on 6 February 1965 in Überlingen, aged 82.

Link to Wikipedia biography



Source Notes

Sy Scholfield provided birth record from Berlin City Archives.


  • Personal : Death : Long life more than 80 yrs (Age 82)
  • Vocation : Education : Teacher (Professor)
  • Vocation : Science : Mathematics/ Statistics
  • Notable : Famous : First in Field
  • Notable : Famous : Founder/ originator ("Jacobsthal sum")
  • Notable : Famous : Founder/ originator ("Jacobsthal number")